Global Patent Index - EP 0380801 A3

EP 0380801 A3 19911106 - PROCESS FOR DETERMINING THE OPTICAL LOSS OF OPTICAL FIBRES IN REFLECTED LIGHT

Title (en)

PROCESS FOR DETERMINING THE OPTICAL LOSS OF OPTICAL FIBRES IN REFLECTED LIGHT

Publication

EP 0380801 A3 19911106 (DE)

Application

EP 89123381 A 19891218

Priority

SU 4688479 A 19890201

Abstract (en)

[origin: EP0380801A2] The process relates to the field of fibre optics, and can be applied to the measurement of small optical losses in optical fibres of various types. <??>The process has the following steps: Coupling a transmitted light pulse into the optical fibre to be measured via a free-wheeling optical fibre (4) whose length lx is at least half the length of the mode distribution set for this type of optical fibres; measuring the energy or the maximum power N0 of the pulse reflected from the output end face of the free-wheeling optical fibre (4); connecting the free-wheeling optical fibre to the optical fibre (5) to be measured; measuring the energy or the maximum power N of the pulse reflected from the output end face of the optical fibre (5) to be measured; and determining the optical losses mu per unit of length in the optical fibre to be measured. <IMAGE>

IPC 1-7

G01M 11/00

IPC 8 full level

G01M 11/00 (2006.01); G01M 11/02 (2006.01); G02B 6/00 (2006.01)

CPC (source: EP US)

G01M 11/31 (2013.01 - EP US)

Citation (search report)

  • [Y] EP 0297669 A2 19890104 - PHILIPS PATENTVERWALTUNG [DE], et al
  • [Y] APPLIED OPTICS, Band 24, Nr. 15, August 1985, Seiten 2313-2322; B.L. DANIELSON: "Optical time-domain reflectometer specifications and performance testing"
  • [A] APPLIED OPTICS, Band 18, Nr. 19, Oktober 1979, Seiten 3272-3275; M. TATEDA et al.: "Optical loss measurement in graded-index fiber using a dummy fiber"

Designated contracting state (EPC)

AT BE CH DE FR GB LI NL SE

DOCDB simple family (publication)

EP 0380801 A2 19900808; EP 0380801 A3 19911106; AU 4898190 A 19900809; BR 9000409 A 19910115; CA 2008799 A1 19900801; CN 1045179 A 19900905; CS 43390 A2 19910611; ES 2020418 A6 19910801; FI 900393 A0 19900125; HU 900256 D0 19900328; HU T57434 A 19911128; JP H02278135 A 19901114; US 5037197 A 19910806

DOCDB simple family (application)

EP 89123381 A 19891218; AU 4898190 A 19900201; BR 9000409 A 19900131; CA 2008799 A 19900129; CN 90100985 A 19900131; CS 43390 A 19900130; ES 9000282 A 19900131; FI 900393 A 19900125; HU 25690 A 19900124; JP 2360390 A 19900201; US 47255690 A 19900131